06-19-2012, 09:46 PM
It may be a little too hard for a HSS tool to bore it.
The angle of the taper is also very critical. I would suggest using a sine bar and indicator to dial in the taper of the compound slide or taper attachment to the correct angle for a 5C collet closer rather than matching whatever might be there as it no longer appears to be the original grind finish.
Once aligned to the correct angle, the tool post grinder would definitely be the best option, but not everyone has one of those. I know I don't....yet.
If the part is hardened, I have some inserts of a very hard carbide grade and/or a couple of CBN-tipped ones. If you don't have similar tooling, tell me what holders you have and I can probably send you something. It's very nice-looking collet closer, and well worth fixing it.
The angle of the taper is also very critical. I would suggest using a sine bar and indicator to dial in the taper of the compound slide or taper attachment to the correct angle for a 5C collet closer rather than matching whatever might be there as it no longer appears to be the original grind finish.
Once aligned to the correct angle, the tool post grinder would definitely be the best option, but not everyone has one of those. I know I don't....yet.
If the part is hardened, I have some inserts of a very hard carbide grade and/or a couple of CBN-tipped ones. If you don't have similar tooling, tell me what holders you have and I can probably send you something. It's very nice-looking collet closer, and well worth fixing it.